I would do spindles fully white, and nothing else. IMO when you mix it up to much including seperating colors, you tend to get the "farmhouse" look going. That flat area tends to attract alot of dust. What product are you using? If I were to do it, I would go with a quality enamel so it can stand up to cleaning, dusting which will probably be more often as it will become more visible on the white. I would use oil based enamel vs a latex as it would spread nicer and dries harder.